1 # Copyright (C) 2006-2014 OpenWrt.org
3 # This is free software, licensed under the GNU General Public License v2.
4 # See /LICENSE for more information.
7 config KERNEL_BUILD_USER
8 string "Custom Kernel Build User Name"
11 Sets the Kernel build user string, which for example will be returned
12 by 'uname -a' on running systems.
13 If not set, uses system user at build time.
15 config KERNEL_BUILD_DOMAIN
16 string "Custom Kernel Build Domain Name"
19 Sets the Kernel build domain string, which for example will be
20 returned by 'uname -a' on running systems.
21 If not set, uses system hostname at build time.
24 bool "Enable support for printk"
27 config KERNEL_CRASHLOG
29 depends on !(arm || powerpc || sparc || TARGET_uml)
33 bool "Support for paging of anonymous memory (swap)"
36 config KERNEL_DEBUG_FS
37 bool "Compile the kernel with debug filesystem enabled"
40 debugfs is a virtual file system that kernel developers use to put
41 debugging files into. Enable this option to be able to read and
42 write to these files. Many common debugging facilities, such as
43 ftrace, require the existence of debugfs.
48 depends on (arm || arm64)
50 config KERNEL_PERF_EVENTS
53 select KERNEL_ARM_PMU if (arm || arm64)
55 config KERNEL_PROFILING
56 bool "Compile the kernel with profiling enabled"
58 select KERNEL_PERF_EVENTS
60 Enable the extended profiling support mechanisms used by profilers such
63 config KERNEL_KALLSYMS
64 bool "Compile the kernel with symbol table information"
65 default y if !SMALL_FLASH
67 This will give you more information in stack traces from kernel oopses.
70 bool "Compile the kernel with tracing support"
71 depends on !TARGET_uml
74 config KERNEL_FTRACE_SYSCALLS
75 bool "Trace system calls"
76 depends on KERNEL_FTRACE
79 config KERNEL_ENABLE_DEFAULT_TRACERS
80 bool "Trace process context switches and events"
81 depends on KERNEL_FTRACE
84 config KERNEL_FUNCTION_TRACER
85 bool "Function tracer"
86 depends on KERNEL_FTRACE
89 config KERNEL_FUNCTION_GRAPH_TRACER
90 bool "Function graph tracer"
91 depends on KERNEL_FUNCTION_TRACER
94 config KERNEL_DYNAMIC_FTRACE
95 bool "Enable/disable function tracing dynamically"
96 depends on KERNEL_FUNCTION_TRACER
99 config KERNEL_FUNCTION_PROFILER
100 bool "Function profiler"
101 depends on KERNEL_FUNCTION_TRACER
104 config KERNEL_DEBUG_KERNEL
108 config KERNEL_DEBUG_INFO
109 bool "Compile the kernel with debug information"
111 select KERNEL_DEBUG_KERNEL
113 This will compile your kernel and modules with debug information.
115 config KERNEL_DEBUG_LL_UART_NONE
120 config KERNEL_DEBUG_LL
124 select KERNEL_DEBUG_LL_UART_NONE
126 ARM low level debugging.
128 config KERNEL_DYNAMIC_DEBUG
129 bool "Compile the kernel with dynamic printk"
130 select KERNEL_DEBUG_FS
133 Compiles debug level messages into the kernel, which would not
134 otherwise be available at runtime. These messages can then be
135 enabled/disabled based on various levels of scope - per source file,
136 function, module, format string, and line number. This mechanism
137 implicitly compiles in all pr_debug() and dev_dbg() calls, which
138 enlarges the kernel text size by about 2%.
140 config KERNEL_EARLY_PRINTK
141 bool "Compile the kernel with early printk"
142 default y if TARGET_bcm53xx
145 select KERNEL_DEBUG_KERNEL
146 select KERNEL_DEBUG_LL if arm
148 Compile the kernel with early printk support. This is only useful for
149 debugging purposes to send messages over the serial console in early boot.
150 Enable this to debug early boot problems.
152 config KERNEL_KPROBES
153 bool "Compile the kernel with kprobes support"
156 select KERNEL_PERF_EVENTS
158 Compiles the kernel with KPROBES support, which allows you to trap
159 at almost any kernel address and execute a callback function.
160 register_kprobe() establishes a probepoint and specifies the
161 callback. Kprobes is useful for kernel debugging, non-intrusive
162 instrumentation and testing.
163 If in doubt, say "N".
165 config KERNEL_KPROBE_EVENT
167 default y if KERNEL_KPROBES
170 bool "Compile the kernel with asynchronous IO support"
173 config KERNEL_DIRECT_IO
174 bool "Compile the kernel with direct IO support"
177 config KERNEL_FHANDLE
178 bool "Compile the kernel with support for fhandle syscalls"
181 config KERNEL_FANOTIFY
182 bool "Compile the kernel with modern file notification support"
185 config KERNEL_BLK_DEV_BSG
186 bool "Compile the kernel with SCSI generic v4 support for any block device"
189 config KERNEL_MAGIC_SYSRQ
190 bool "Compile the kernel with SysRq support"
193 config KERNEL_COREDUMP
196 config KERNEL_ELF_CORE
197 bool "Enable process core dump support"
198 select KERNEL_COREDUMP
201 config KERNEL_PROVE_LOCKING
202 bool "Enable kernel lock checking"
203 select KERNEL_DEBUG_KERNEL
206 config KERNEL_PRINTK_TIME
207 bool "Enable printk timestamps"
210 config KERNEL_SLUB_DEBUG
213 config KERNEL_SLUB_DEBUG_ON
216 config KERNEL_SLABINFO
217 select KERNEL_SLUB_DEBUG
218 select KERNEL_SLUB_DEBUG_ON
219 bool "Enable /proc slab debug info"
221 config KERNEL_PROC_PAGE_MONITOR
222 bool "Enable /proc page monitoring"
228 bool "Enable kexec support"
231 bool "Enable rfkill support"
232 default RFKILL_SUPPORT
235 bool "Enable sparse check during kernel build"
238 config KERNEL_DEVTMPFS
239 bool "Compile the kernel with device tmpfs enabled"
242 devtmpfs is a simple, kernel-managed /dev filesystem. The kernel creates
243 devices nodes for all registered devices ti simplify boot, but leaves more
244 complex tasks to userspace (e.g. udev).
248 config KERNEL_DEVTMPFS_MOUNT
249 bool "Automatically mount devtmpfs after root filesystem is mounted"
255 bool "Enable kernel access key retention support"
258 config KERNEL_PERSISTENT_KEYRINGS
259 bool "Enable kernel persistent keyrings"
260 depends on KERNEL_KEYS
263 config KERNEL_BIG_KEYS
264 bool "Enable large payload keys on kernel keyrings"
265 depends on KERNEL_KEYS
268 config KERNEL_ENCRYPTED_KEYS
269 tristate "Enable keys with encrypted payloads on kernel keyrings"
270 depends on KERNEL_KEYS
274 # CGROUP support symbols
277 config KERNEL_CGROUPS
278 bool "Enable kernel cgroups"
283 config KERNEL_CGROUP_DEBUG
284 bool "Example debug cgroup subsystem"
287 This option enables a simple cgroup subsystem that
288 exports useful debugging information about the cgroups
291 config KERNEL_FREEZER
293 default y if KERNEL_CGROUP_FREEZER
295 config KERNEL_CGROUP_FREEZER
296 bool "Freezer cgroup subsystem"
299 Provides a way to freeze and unfreeze all tasks in a
302 config KERNEL_CGROUP_DEVICE
303 bool "Device controller for cgroups"
306 Provides a cgroup implementing whitelists for devices which
307 a process in the cgroup can mknod or open.
309 config KERNEL_CGROUP_PIDS
310 bool "PIDs cgroup subsystem"
313 Provides enforcement of process number limits in the scope of a
316 config KERNEL_CPUSETS
317 bool "Cpuset support"
320 This option will let you create and manage CPUSETs which
321 allow dynamically partitioning a system into sets of CPUs and
322 Memory Nodes and assigning tasks to run only within those sets.
323 This is primarily useful on large SMP or NUMA systems.
325 config KERNEL_PROC_PID_CPUSET
326 bool "Include legacy /proc/<pid>/cpuset file"
328 depends on KERNEL_CPUSETS
330 config KERNEL_CGROUP_CPUACCT
331 bool "Simple CPU accounting cgroup subsystem"
334 Provides a simple Resource Controller for monitoring the
335 total CPU consumed by the tasks in a cgroup.
337 config KERNEL_RESOURCE_COUNTERS
338 bool "Resource counters"
341 This option enables controller independent resource accounting
342 infrastructure that works with cgroups.
344 config KERNEL_MM_OWNER
346 default y if KERNEL_MEMCG
349 bool "Memory Resource Controller for Control Groups"
351 depends on KERNEL_RESOURCE_COUNTERS || !LINUX_3_18
353 Provides a memory resource controller that manages both anonymous
354 memory and page cache. (See Documentation/cgroups/memory.txt)
356 Note that setting this option increases fixed memory overhead
357 associated with each page of memory in the system. By this,
358 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
359 usage tracking struct at boot. Total amount of this is printed out
362 Only enable when you're ok with these tradeoffs and really
363 sure you need the memory resource controller. Even when you enable
364 this, you can set "cgroup_disable=memory" at your boot option to
365 disable memory resource controller and you can avoid overheads
366 (but lose benefits of memory resource controller).
368 This config option also selects MM_OWNER config option, which
369 could in turn add some fork/exit overhead.
371 config KERNEL_MEMCG_SWAP
372 bool "Memory Resource Controller Swap Extension"
374 depends on KERNEL_MEMCG
376 Add swap management feature to memory resource controller. When you
377 enable this, you can limit mem+swap usage per cgroup. In other words,
378 when you disable this, memory resource controller has no cares to
379 usage of swap...a process can exhaust all of the swap. This extension
380 is useful when you want to avoid exhaustion swap but this itself
381 adds more overheads and consumes memory for remembering information.
382 Especially if you use 32bit system or small memory system, please
383 be careful about enabling this. When memory resource controller
384 is disabled by boot option, this will be automatically disabled and
385 there will be no overhead from this. Even when you set this config=y,
386 if boot option "swapaccount=0" is set, swap will not be accounted.
387 Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
388 size is 4096bytes, 512k per 1Gbytes of swap.
390 config KERNEL_MEMCG_SWAP_ENABLED
391 bool "Memory Resource Controller Swap Extension enabled by default"
393 depends on KERNEL_MEMCG_SWAP
395 Memory Resource Controller Swap Extension comes with its price in
396 a bigger memory consumption. General purpose distribution kernels
397 which want to enable the feature but keep it disabled by default
398 and let the user enable it by swapaccount boot command line
399 parameter should have this option unselected.
401 Those who want to have the feature enabled by default should
402 select this option (if, for some reason, they need to disable it,
403 then swapaccount=0 does the trick).
406 config KERNEL_MEMCG_KMEM
407 bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
409 depends on KERNEL_MEMCG
411 The Kernel Memory extension for Memory Resource Controller can limit
412 the amount of memory used by kernel objects in the system. Those are
413 fundamentally different from the entities handled by the standard
414 Memory Controller, which are page-based, and can be swapped. Users of
415 the kmem extension can use it to guarantee that no group of processes
416 will ever exhaust kernel resources alone.
418 config KERNEL_CGROUP_PERF
419 bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
420 select KERNEL_PERF_EVENTS
423 This option extends the per-cpu mode to restrict monitoring to
424 threads which belong to the cgroup specified and run on the
427 menuconfig KERNEL_CGROUP_SCHED
428 bool "Group CPU scheduler"
431 This feature lets CPU scheduler recognize task groups and control CPU
432 bandwidth allocation to such task groups. It uses cgroups to group
435 if KERNEL_CGROUP_SCHED
437 config KERNEL_FAIR_GROUP_SCHED
438 bool "Group scheduling for SCHED_OTHER"
441 config KERNEL_CFS_BANDWIDTH
442 bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
444 depends on KERNEL_FAIR_GROUP_SCHED
446 This option allows users to define CPU bandwidth rates (limits) for
447 tasks running within the fair group scheduler. Groups with no limit
448 set are considered to be unconstrained and will run with no
450 See tip/Documentation/scheduler/sched-bwc.txt for more information.
452 config KERNEL_RT_GROUP_SCHED
453 bool "Group scheduling for SCHED_RR/FIFO"
456 This feature lets you explicitly allocate real CPU bandwidth
457 to task groups. If enabled, it will also make it impossible to
458 schedule realtime tasks for non-root users until you allocate
459 realtime bandwidth for them.
463 config KERNEL_BLK_CGROUP
464 bool "Block IO controller"
467 Generic block IO controller cgroup interface. This is the common
468 cgroup interface which should be used by various IO controlling
471 Currently, CFQ IO scheduler uses it to recognize task groups and
472 control disk bandwidth allocation (proportional time slice allocation)
473 to such task groups. It is also used by bio throttling logic in
474 block layer to implement upper limit in IO rates on a device.
476 This option only enables generic Block IO controller infrastructure.
477 One needs to also enable actual IO controlling logic/policy. For
478 enabling proportional weight division of disk bandwidth in CFQ, set
479 CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
480 CONFIG_BLK_DEV_THROTTLING=y.
482 config KERNEL_DEBUG_BLK_CGROUP
483 bool "Enable Block IO controller debugging"
485 depends on KERNEL_BLK_CGROUP
487 Enable some debugging help. Currently it exports additional stat
488 files in a cgroup which can be useful for debugging.
490 config KERNEL_NET_CLS_CGROUP
491 bool "Control Group Classifier"
494 config KERNEL_NETPRIO_CGROUP
495 bool "Network priority cgroup"
501 # Namespace support symbols
504 config KERNEL_NAMESPACES
505 bool "Enable kernel namespaces"
514 In this namespace, tasks see different info provided
515 with the uname() system call.
521 In this namespace, tasks work with IPC ids which correspond to
522 different IPC objects in different namespaces.
524 config KERNEL_USER_NS
525 bool "User namespace (EXPERIMENTAL)"
528 This allows containers, i.e. vservers, to use user namespaces
529 to provide different user info for different servers.
532 bool "PID Namespaces"
535 Support process id namespaces. This allows having multiple
536 processes with the same pid as long as they are in different
537 pid namespaces. This is a building block of containers.
540 bool "Network namespace"
543 Allow user space to create what appear to be multiple instances
544 of the network stack.
549 # LXC related symbols
552 config KERNEL_LXC_MISC
553 bool "Enable miscellaneous LXC related options"
558 config KERNEL_DEVPTS_MULTIPLE_INSTANCES
559 bool "Support multiple instances of devpts"
562 Enable support for multiple instances of devpts filesystem.
563 If you want to have isolated PTY namespaces (eg: in containers),
564 say Y here. Otherwise, say N. If enabled, each mount of devpts
565 filesystem with the '-o newinstance' option will create an
566 independent PTY namespace.
568 config KERNEL_POSIX_MQUEUE
569 bool "POSIX Message Queues"
572 POSIX variant of message queues is a part of IPC. In POSIX message
573 queues every message has a priority which decides about succession
574 of receiving it by a process. If you want to compile and run
575 programs written e.g. for Solaris with use of its POSIX message
576 queues (functions mq_*) say Y here.
578 POSIX message queues are visible as a filesystem called 'mqueue'
579 and can be mounted somewhere if you want to do filesystem
580 operations on message queues.
584 config KERNEL_SECCOMP_FILTER
588 config KERNEL_SECCOMP
589 bool "Enable seccomp support"
590 depends on !(TARGET_uml)
591 select KERNEL_SECCOMP_FILTER
594 Build kernel with support for seccomp.
605 config KERNEL_IPV6_MULTIPLE_TABLES
608 config KERNEL_IPV6_SUBTREES
611 config KERNEL_IPV6_MROUTE
614 config KERNEL_IPV6_PIMSM_V2
620 # NFS related symbols
623 bool "Compile the kernel with rootfs on NFS"
625 If you want to make your kernel boot off a NFS server as root
626 filesystem, select Y here.
630 config KERNEL_IP_PNP_DHCP
633 config KERNEL_IP_PNP_BOOTP
636 config KERNEL_IP_PNP_RARP
648 config KERNEL_ROOT_NFS
653 menu "Filesystem ACL and attr support options"
654 config USE_FS_ACL_ATTR
655 bool "Use filesystem ACL and attr support by default"
658 Make using ACLs (e.g. POSIX ACL, NFSv4 ACL) the default
659 for kernel and packages, except tmpfs, flash filesystems,
660 and old NFS. Also enable userspace extended attribute support
661 by default. (OpenWrt already has an expection it will be
662 present in the kernel).
664 config KERNEL_FS_POSIX_ACL
665 bool "Enable POSIX ACL support"
666 default y if USE_FS_ACL_ATTR
668 config KERNEL_BTRFS_FS_POSIX_ACL
669 bool "Enable POSIX ACL for BtrFS Filesystems"
670 select KERNEL_FS_POSIX_ACL
671 default y if USE_FS_ACL_ATTR
673 config KERNEL_EXT4_FS_POSIX_ACL
674 bool "Enable POSIX ACL for Ext4 Filesystems"
675 select KERNEL_FS_POSIX_ACL
676 default y if USE_FS_ACL_ATTR
678 config KERNEL_F2FS_FS_POSIX_ACL
679 bool "Enable POSIX ACL for F2FS Filesystems"
680 select KERNEL_FS_POSIX_ACL
683 config KERNEL_JFFS2_FS_POSIX_ACL
684 bool "Enable POSIX ACL for JFFS2 Filesystems"
685 select KERNEL_FS_POSIX_ACL
688 config KERNEL_TMPFS_POSIX_ACL
689 bool "Enable POSIX ACL for TMPFS Filesystems"
690 select KERNEL_FS_POSIX_ACL
693 config KERNEL_CIFS_ACL
694 bool "Enable CIFS ACLs"
695 select KERNEL_FS_POSIX_ACL
696 default y if USE_FS_ACL_ATTR
698 config KERNEL_HFS_FS_POSIX_ACL
699 bool "Enable POSIX ACL for HFS Filesystems"
700 select KERNEL_FS_POSIX_ACL
701 default y if USE_FS_ACL_ATTR
703 config KERNEL_HFSPLUG_FS_POSIX_ACL
704 bool "Enable POSIX ACL for HFS+ Filesystems"
705 select KERNEL_FS_POSIX_ACL
706 default y if USE_FS_ACL_ATTR
708 config KERNEL_NFS_ACL_SUPPORT
709 bool "Enable ACLs for NFS"
710 default y if USE_FS_ACL_ATTR
712 config KERNEL_NFS_V3_ACL_SUPPORT
713 bool "Enable ACLs for NFSv3"
716 config KERNEL_NFSD_V2_ACL_SUPPORT
717 bool "Enable ACLs for NFSDv2"
720 config KERNEL_NFSD_V3_ACL_SUPPORT
721 bool "Enable ACLs for NFSDv3"
724 config KERNEL_REISER_FS_POSIX_ACL
725 bool "Enable POSIX ACLs for ReiserFS"
726 select KERNEL_FS_POSIX_ACL
727 default y if USE_FS_ACL_ATTR
729 config KERNEL_XFS_POSIX_ACL
730 bool "Enable POSIX ACLs for XFS"
731 select KERNEL_FS_POSIX_ACL
732 default y if USE_FS_ACL_ATTR
734 config KERNEL_JFS_POSIX_ACL
735 bool "Enable POSIX ACLs for JFS"
736 select KERNEL_FS_POSIX_ACL
737 default y if USE_FS_ACL_ATTR